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Glossary
Issue 2.0 December 1995 GL-9
common control switch processor over a direct memory access (DMA) channel that reads data
directly from FP memory.
data link
A term used to describe the communications link used for data transmission from a source to a
destination. For example, a phone line for data transmission.
data service unit (DSU)
A device used to access digital data channels. DATAPHONE II 2500 DSUs are synchronous data
communications equipment (DCE) devices used for extended-local AT&T Intuity system
connections. The 2600 or 2700 series may also be used; these are more expensive DSU options
and support diagnostic testing and the DATAPHONE II Service network system.
data set
AT&T term for a modem. A data set usually includes the telephone. See also
modem
.
data terminal equipment (DTE)
Standard type of data interface normally used for the endpoints in a connection. Normally the
AT&T Intuity system, most terminals, and the switch data link are DTE devices.
data terminal ready (DTR)
A control signal sent from the data terminal equipment (DTE) to the data communications
equipment (DCE) that indicates the DTE is on and ready to communicate.
DBP
See
data base processor
.
DCE
See
data communications equipment
.
DCIU
See
data communications interface unit
.
DCP
See
digital communications protocol
.
DCS
See
distributed communications system
.
debug
See
troubleshoot
.
dedicated line
A communications path that does not go through a switch. A dedicated (hard-wired) path may be
formed with directly connected cables. MPDMs, DSUs, or other devices may also be used to
extend the distance that signals can travel directly through the building wiring.
default
A value that is automatically supplied by the system if no other value is specified.
default print number
The subscriber-administered extension to which autoprinted faxes are redirected upon their
receipt into the subscriber’s mailbox. This default print destination is also provided as a print
option when the subscriber is manually retrieving and printing faxes from the mailbox.
delivered message
A message that has been successfully transmitted to a recipient's incoming mailbox.
demand testing
Testing performed on request (usually by service personnel).